MATS/LaSpec
Status report
Alexander Herlert
FAIR GmbH
on behalf of the MATS and LaSpec Collaborations
Thanks to W. Nörtershäuser, D. Rodríguez, P. Campell, I. Moore, and G.
Neyens for providing slides/material
NuSTAR Week 2011, Bucharest, October 17-21, 2011
MATS & LaSpec stands for
Precise Measurements on very shortlived nuclei using an Advanced
Trapping System
10 countries, 24 institutes, 87 members
Laser Spectroscopy on very shortlived nuclei
8 countries, 13 institutes, 34 members
MATS & LaSpec at the LEB/FAIR
Laser Spectroscopy
MR-TOF
RFQ cooler & buncher
MATS
EBIT
Dipole magnet
Gas cell
for more information see: Technical Design Report of MATS & LaSpec:
D. Rodriguez, K. Blaum, W. Nörtershäuser et al.EPJ Special Topics 183 (2010) 1-123
MATS & LaSpec at the LEB/FAIR
ß-NMR: Leuven
Collinear Atom Beamline +
Optical Pumping: Mainz
Technical Design Report of MATS & LaSpec:
D. Rodriguez, K. Blaum, W. Nörtershäuser et al.EPJ Special Topics 183 (2010) 1-123
Collinear Ion Beamline:
Manchester
RFQ: JYFL
3-stage rf cooler for MATS and LaSpec
He in (0.04 mbar)
Deceleration
QP deflector
+einzel
RFQ trap
Drift tube &
acceleration
Mini
RFQ
Valve
Valve
Insulator
Turbo
Turbo
Turbo
Electrode design similar to ISCOOL
Simulation results:
• Emittance ~6π mm mrad, ΔE~ 3 eV, δT ~3 ms for
2 keV pulse of ejected 133Cs+ when using buffer gas
at 80 K.
• 80% injection efficiency, when assuming parallel
beam d=4 mm, (40 kV) before deceleration
Layout of the TRIGA-Spec experiment
• Mass measurements have been already performed
• Important work going on the ion source (helios) in order to make
practicable more elements from the californium source
K. Blaum,
W. Nörtershäuser et al (MPIK)
Prototyping & Development @ TRIGA-Spec
Recently added:
RFQ cooler and buncher
(COLETTE)
common
beamline
Statusof
ofthe
theLASPEC
LASPECPrototype
Prototype
Status
Titelmasterformat
durch Klicken
atthe
theTRIGA-Reactor
TRIGA-ReactorininMainz
Mainz
at
bearbeiten
Laser Spectroscopy of
Highly Charged Ions and
Exotic Radioactive Nuclei
D. Lunney, NIM A598 (2009) 379-387
beam diagnostics for
MATS and LASPEC
(MCP and imaging
optics for beam
profile control)
build and testing
laser spectroscopy
on praseodymium
ISOLDE, CERN
TRIGA,
Mainz
(preparatory work
under realistic
conditions for on-line
runs, e.g. at ISOLDE)
successfully tested
RFQ cooler and buncher
(in preparation for on-line
coupling to the reactor)
currently comissioning
Optical pumping & Conetraps
-Use intra cooler optical pumping to selectively
populate desired ionic state
-Greatly enhanced efficiencies and spectroscopic
access to previously “impossible” elements
-Can be used in electrostatic traps which
double as “energy elevators” in LaSpec
P. Reinhed et al., NIM A621 (2010) 83
A new optical detection region for Collinear Laser Spectroscopy
(Design: M.L. Bissell, K.U. Leuven, Belgium)
Optical detection efficiency improved by factor 10
+ background photon detection reduced by 50% !
Electron Tubes 9658B
2” PMT , S20 IR sensitive
photocathode
Use refrigerant circulator
FP40-MC to cool
photocathode to -30C
via Cu heat exchanger.
100 mm Ø aspheric
lenses
Mark Bissell et al., NIM, in preparation
Light collection efficiency %
Laser / K beam
detected region
Simulated efficiency of new and
previous set-up: gain ≈ 14x
20
15
10
5
0
0
100
200
300
Distance from CEC chamber (mm)
400
Experimental sequence for MATS
Measurement
Penning
trap
Gas
catcher
RFQ
buncher
MR-TOFMS
EBIT
Preparation
Penning trap
Detector
trap
MR-TOF-MS (UGießen)
• Mass resolving power (FWHM)
m/m = 100,000 (5 ms TOF)
• Isobar separation
Demonstrated for C6H6 and 13C12C5H5
(Intensity ratio 170:1, m = 4 MeV)
• Ion capacity
> 104 per cycle and >106 per second
Internal
Ion Source
10-4 mbar
Separated
Ions
Ions
Injection
Trap System
Curved
RFQs
10-2 mbar
Differential
Pumping
Section
133Cs+
12 ms TOF
10-6 mbar
Energy
Buncher
Time-of-Flight
Analyzer
Kinetic Energy
1.5 keV
Gate Detectors
Ion Gate
10-8 mbar
Post-Analyzer
Reflector
Aux. Detector
W. R. Plass et al
Isochronous
SEM
Mass Measurement
Test for the LEB: MR-TOF-MS at the
FRS Ion Catcher
~ GeV/u
Fragment Separator FRS
Production, separation and
range-bunching
~ MeV/u
Cryogenic Stopping Cell
Stopping, thermalization,
extraction
~ eV
RFQ Beam Line
Ion cooling, transmission,
differential pumping,
isotope separation,
diagnosis, beam distribution
introduction of reference ions
~ keV
Multiple-reflection TOF-MS
Ion identification,
isobar separation
direct mass measurements
W.R. Plaß et al., GSI Scientific Report 2010, p. 137 (2011)
MR-TOF-MS was commissioned successfully at the FRS Ion Catcher
in the S411 experiment (07.10. - 12.10.2011)!
(See talk by H. Geissel)
EBIT (MPIK Heidelberg)
1. High electron current up to 2000 mA.
2. High ion densities: 106 to 1010 ions/cm3
Fraction of ions in charge state
1.0
0.8
He-like Fe
24+
0.6
Ne-like Fe
16+
0.4
0.2
0.0 -4
10
10
-3
10
-2
10
Charge breeding time (s)
6 keV, 2 A electron beam. Current density 1400
A/cm2, background pressure 10-10 mbar (H2), ion
temperature
300 eV. The calculation includes
(EBIT at TRIUMF)
radiative
J. R.recombination
Crespo et al (MPIK)and charge exchange.
(Courtesy of J.R. Crespo)
-1
Penning traps (UGW, MPIK Heidelberg, GSI, UGR)
•
•
Study of the injection of ions into the field of a 12 T Magnet (UGW)
Design of an alignment support for the trap (UGW)
1-
Aun
(Superconducting magnet at UGW )
(L. Schweikhard, G. Marx et al)
(Courtesy of 10
J.R. Crespo)
15
20
cluster size n
25
Ion detection for the Penning traps (UGR, MPIK, UGW)
Detection in the preparation Penning
trap
1. Cryogenic environment and UHV.
2. Broad-band mass identification
Amplifier in vacuum (UGR)
D. Rodríguez et al
Technical drawing of the setup at UGR for
FT-ICR tests J. M. Cornejo, Master thesis (UGR)
The detection in the measurement
Penning trap:
FT-ICR for single ion sensitivity
Amplifier in air (UGR)
Coil for single ion
Detection (UGR)
C. Weber PhD Thesis (UM)
R. Ferrer, PhD Thesis (UM)
The Detector Trap (LMU Munich)
Characteristics:
• Replace inner Penning trap electrode by
cubic setup of 4 Si-strip detectors
• Use detector bias for trapping potential
mock-up:
detector carrier boards between trap electrodes
(P. Thirolf et al)
Penning trap
electrodes:
strip detector
•
•
Detector dimensions given by: space in
magnet bore, required position
resolution, efficiency optimization
Detectors need to comply with UHV and
cryogenic conditions
Developments also carried out at PNPI
An funding has been received
cryotest:
lN2 temperature, selection of groove dimensions
Off-line ion source (PNPI)
Y. Nu. Novikiov et al
Funding ID (Preconstruction-MoU)
Status and perspectives
• FAIR will offer unique opportunities with RIB
• MATS & LaSpec will incorporate the most advanced technical developments on ion
traps, lasers and beam preparation
• The Technical Design Report was approved in May 2010
• Several groups have received funding to start the construction of the different
components
• A large number of laser and Penning trap setups at different European institutes,
universities and RIB facilities can be used for developing very advanced components
(MPI-K, JYFL, ISOLDE, KVI, GSI, TRIGA, UGR, UGW, UG, SPIRAL2...)
• MATS can be tested and can be ready before FAIR is in operation
• Unfortunately, the first stage of the modularized start version of FAIR does not
include the low energy beam line where MATS & LaSpec will be placed